知识资本是知识经济时代企业内生性生产要素，其边际收益递增的区间明显扩大。
Knowledge capital is one of originally inherented productive factors of a firm in knowledge economy era, and firm marginal profit space has been extended obviously with increasing knowledge capital.
证明了区间值三角模左连续的充要条件是保递增并，右连续的充要条件是保递减交。
It is proved that a triangular norm is left-continuous if and only if is increasing union-preserving, and is right-continuous if and only if is decreasing intersection-preserving.
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